145521191 has 2 divisors, whose sum is σ = 145521192. Its totient is φ = 145521190.

The previous prime is 145521169. The next prime is 145521221. The reversal of 145521191 is 191125541.

145521191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145521191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145521121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72760595 + 72760596.

It is an arithmetic number, because the mean of its divisors is an integer number (72760596).

Almost surely, 2^145521191 is an apocalyptic number.

145521191 is a deficient number, since it is larger than the sum of its proper divisors (1).

145521191 is an equidigital number, since it uses as much as digits as its factorization.

145521191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 29.

The square root of 145521191 is about 12063.2164450448. The cubic root of 145521191 is about 525.9874880763.

The spelling of 145521191 in words is "one hundred forty-five million, five hundred twenty-one thousand, one hundred ninety-one".